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Main Pumping Station Diversions Project

Drop Shaft Near Tingey Street SE


The Main Pumping Station Diversions Project is an essential component of the Clean Rivers Project. Currently, practically every time it rains, combined sewage overflows into the Anacostia River from the District’s antiquated sewerage system. Two diversion chambers will be installed near Tingey Street to divert combined sewer overflows (CSOs) into the Blue Plains Tunnel by way of the Main Pumping Station Drop Shaft. The Blue Plains Tunnel will store and convey the CSOs to the Blue Plains Advanced Wastewater Treatment Plant for treatment prior to discharge to the Potomac River. Ventilation control facilities will be constructed within the Main Pumping Station Drop Shaft to regulate air flow in the tunnel system.

The project is situated directly in front of DC Water's Main Pumping Station, an historic building, originally built in the early 1900’s. The above ground portions of the Main Pumping Station Diversions are being constructed within the Main Pumping Station compound. Final design of the structures has been coordinated with the District Historic Preservation Review Board (HPRB), the Commission of Fine Arts (CFA) and the National Capital Planning Commission (NCPC), ensuring compatibility with the historic Main Pumping Station building.

Scope of Work

  •  Installation of two diversion chambers along Tingey Street to carry CSOs to the Blue Plains Tunnel via the Main Pumping Station Drop Shaft
  •  Construction of ventilation control facilities above a 55-foot diameter concrete shaft which will serve as both access and terminus points for the Blue Plains Tunnel


Item Date
Construction Start May 2014
Construction Finish October 2017

Construction of the Main Pumping Station Diversions is in full swing as the team focuses on excavation and concrete work.

100 year old Brick Arch Tiber Creek Trunk Sewer at Main Pumping Station (click to enlarge)


Curved Approach Channel and Surge Tank 40 feet deep at Main Pumping Station Diversions (click to enlarge)


Main Pumping Station Shaft and Vortex Drop Pipe (click to enlarge)



DC Water is currently working closely with multiple stakeholders to provide timely information about the project, to solicit input, and to ease the burdens of construction. These stakeholders include residents, the Capitol Riverfront Business Improvement District, the JBG Companies, Forest City Washington, District Department of Transportation, The Yards Development, Nationals Park and the US Department of Transportation. DC Water is also coordinating with Advisory Neighborhood Commissions to provide regular updates.

Project Location Map